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Finding the Fourth Proportional to 85,871.10, 128,818.80 and 26,700.60

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Solution

The fourth proportional to 85,871.10, 128,818.80 and 26,700.60 is: 40,054.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,871.10 : 128,818.80 = 26,700.60 : x
  2. Step 2: Convert to fraction form
    85,871.10/128,818.80 = 26,700.60/x
  3. Step 3: Cross multiply
    85,871.10x = 128,818.80 × 26,700.60
  4. Step 4: Simplify right side
    85,871.10x = 3,439,539,251.28
  5. Step 5: Solve for x
    x = 3,439,539,251.28/85,871.10
  6. Step 6: Final answer
    x = 40,054.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.